(third-person singular simple present lights up, present participle lighting up, simple past and past participle lit up)
- To bring light to something, to brighten.
- (intransitive) To become light, to brighten.
- He saw Mary and his face lit up.
- (intransitive) To light a cigarette, pipe, etc.
- Smoking in this building is not allowed, so I always step outside to light up.
- To make happy.
- (slang) To open fire on a target or group of targets.